/**
 * Software License, Version 1.0
 * 
 * Copyright 2003 The Trustees of Indiana University.  All rights reserved.
 * 
 *
 *Redistribution and use in source and binary forms, with or without 
 *modification, are permitted provided that the following conditions are met:
 *
 *1) All redistributions of source code must retain the above copyright notice,
 * the list of authors in the original source code, this list of conditions and
 * the disclaimer listed in this license;
 *2) All redistributions in binary form must reproduce the above copyright 
 * notice, this list of conditions and the disclaimer listed in this license in
 * the documentation and/or other materials provided with the distribution;
 *3) Any documentation included with all redistributions must include the 
 * following acknowledgement:
 *
 *"This product includes software developed by the Community Grids Lab. For 
 * further information contact the Community Grids Lab at 
 * http://communitygrids.iu.edu/."
 *
 * Alternatively, this acknowledgement may appear in the software itself, and 
 * wherever such third-party acknowledgments normally appear.
 * 
 *4) The name Indiana University or Community Grids Lab or NaradaBrokering, 
 * shall not be used to endorse or promote products derived from this software 
 * without prior written permission from Indiana University.  For written 
 * permission, please contact the Advanced Research and Technology Institute 
 * ("ARTI") at 351 West 10th Street, Indianapolis, Indiana 46202.
 *5) Products derived from this software may not be called NaradaBrokering, 
 * nor may Indiana University or Community Grids Lab or NaradaBrokering appear
 * in their name, without prior written permission of ARTI.
 * 
 *
 * Indiana University provides no reassurances that the source code provided 
 * does not infringe the patent or any other intellectual property rights of 
 * any other entity.  Indiana University disclaims any liability to any 
 * recipient for claims brought by any other entity based on infringement of 
 * intellectual property rights or otherwise.  
 *
 *LICENSEE UNDERSTANDS THAT SOFTWARE IS PROVIDED "AS IS" FOR WHICH NO 
 *WARRANTIES AS TO CAPABILITIES OR ACCURACY ARE MADE. INDIANA UNIVERSITY GIVES
 *NO WARRANTIES AND MAKES NO REPRESENTATION THAT SOFTWARE IS FREE OF 
 *INFRINGEMENT OF THIRD PARTY PATENT, COPYRIGHT, OR OTHER PROPRIETARY RIGHTS. 
 *INDIANA UNIVERSITY MAKES NO WARRANTIES THAT SOFTWARE IS FREE FROM "BUGS", 
 *"VIRUSES", "TROJAN HORSES", "TRAP DOORS", "WORMS", OR OTHER HARMFUL CODE.  
 *LICENSEE ASSUMES THE ENTIRE RISK AS TO THE PERFORMANCE OF SOFTWARE AND/OR 
 *ASSOCIATED MATERIALS, AND TO THE PERFORMANCE AND VALIDITY OF INFORMATION 
 *GENERATED USING SOFTWARE.
 */
package cgl.narada.transport.multicast;

import java.net.DatagramPacket;
import java.net.MulticastSocket;
import java.net.SocketException;
import java.util.StringTokenizer;

import cgl.narada.protocol.Protocol;
import cgl.narada.transport.TransportDebugFlags;
import cgl.narada.transport.TransportHandler;
/** 
    The receiver end of the Multicast communications. Listens for packets 
    arriving at a socket and performs various operations based on situations 
    arising during communications. These received packets are then encapsulated
    into a specialized data structure and forwarded to the transport handler 
    implenetation residing in the transport layer.
    
    @author Shrideep Pallickara
    $Revision$
    $Date$
*/

public class MulticastReceiverThread extends Thread 
  implements TransportDebugFlags{
  private MulticastSocket socket;
  private int port;
  public final static int MAX_PACKET_SIZE = 65507;
  private byte[] buffer = new byte[16000];
  private int messageTracker=0;
  private String moduleName = "MulticastReceiverThread: ";
  private MulticastLinkFactory multicastLinkFactory;
  private TransportHandler transportHandler;
  
  public MulticastReceiverThread(MulticastSocket socket, 
				 MulticastLinkFactory  multicastLinkFactory) {
    this.socket = socket;
    this.multicastLinkFactory = multicastLinkFactory;
    transportHandler = multicastLinkFactory.getTransportHandler();
    byte[] buffer = new byte[MAX_PACKET_SIZE];
  }
  
  
  public void run() {
    DatagramPacket dp = new DatagramPacket(buffer, buffer.length);
    if (MulticastReceiverThread_Debug) 
      System.out.println(moduleName + "waiting for Datagram packets on port " +
			 socket.getLocalPort() + "...");
    StringTokenizer token;
    int dataInfo;
    int dataLength;
    int port;
    String address;
    try {
      while (true) {
	socket.receive(dp);
	
	byte[] data = dp.getData();
	port = dp.getPort();
	dataLength = dp.getLength();
	//System.out.print("[ r" + messageTracker++  
	//	 + ", l"+ dataLength + " ]\n");
	
	dataInfo = (int) data[0];
	if (dataInfo == Protocol.DATA) {
	  String hostInfo = dp.getAddress().getHostName();
	  int portInfo = dp.getPort();
	  String sender = "multicast://" + hostInfo +":" + port;
	  if (MulticastReceiverThread_Debug) {
	    System.out.println(moduleName + "Received [" + 
			       new String(data, 1, dataLength-1) +
			       "] from (" + hostInfo + ":" + portInfo  + ")");
	  }
	  
	  byte[] dataRecv = new byte[dataLength];
	  System.arraycopy(data, 1, dataRecv, 0, dataLength-1);
	  transportHandler.dataReceived(dataRecv, sender); 
	}
	dp.setLength(buffer.length);
	//Thread.yield();
      }
    } catch (SocketException se) {
      se.printStackTrace();
    } catch (java.io.IOException ioe) {
      ioe.printStackTrace();
    } /* end try-catch*/
  }/* end (run) */
  
}


